Cooling Tower Flow Control Valves

Availability of excessive flow rate at downstream of all taps (water outlet); because a PRV, installed at an entry point results in reduction of static pressure to a desired level (a part of total pressure), only and not in reducing of total pressure.
Un-equal water distribution at downstream of water taps; whenever, two or more water taps are being used for water collection, simultaneously.
From practice, it has also been observed that in buildings of a hill area; none of the water management device is being used because; PRV is a costly device (with frequent repair requirements and limited useful life). Also, in hill areas, most of the people are of weaker financial status living at below the poverty line i.e. at the base of pyramid.